FileSystemWatcher事件未触发

本文关键字：事件 FileSystemWatcher | 更新日期: 2023-09-27 18:04:37

我的FileSystemWatcher没有抛出任何事件。我看过这些类似的问题，似乎没有一个能回答我的问题:

*编辑:我的目标是捕获当一个XLS文件被复制到一个目录或在一个目录中创建。

  • Filesystemwatcher 't trigger event
  • FileSystemWatcher -事件没有第二次触发
  • FileSystemWatcher Changed event does 't fire
  • FileSystemWatcher -只有更改事件一次触发一次?

监控类:

public class Monitor
{
    FileSystemWatcher watcher = new FileSystemWatcher();
    readonly string bookedPath = @"''SomeServer'SomeFolder'";
    public delegate void FileDroppedEvent(string FullPath);
    public event FileDroppedEvent FileDropped;
    public delegate void ErrorEvent(Exception ex);
    public event ErrorEvent Error;
    public Monitor()
    {
        watcher.Path = bookedPath;
        watcher.Filter = "*.xls";
        watcher.NotifyFilter = NotifyFilters.LastWrite;
        watcher.Changed += new FileSystemEventHandler(watcher_Changed);
        watcher.Error += new ErrorEventHandler(watcher_Error);
    }
    void watcher_Error(object sender, ErrorEventArgs e)
    {
        Error(e.GetException());
    }
    void watcher_Changed(object sender, FileSystemEventArgs e)
    {
        if (e.ChangeType != WatcherChangeTypes.Created) return;
        FileDropped(e.FullPath);
    }
    public void Start()
    {
        watcher.EnableRaisingEvents = true;
    }
    public void Stop()
    {
        watcher.EnableRaisingEvents = false;
    }
}

简单的表单与列表框:

public partial class Form1 : Form
{
    Monitor monitor = new Monitor();
    public Form1()
    {
        InitializeComponent();
        FormClosing += new FormClosingEventHandler(Form1_FormClosing);
        Load += new EventHandler(Form1_Load);
        monitor.FileDropped += new Monitor.FileDroppedEvent(monitor_FileDropped);
        monitor.Error += new Monitor.ErrorEvent(monitor_Error);
    }
    void Form1_Load(object sender, EventArgs e)
    {
        monitor.Start();
    }
    void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        monitor.Stop();
    }
    void monitor_Error(Exception ex)
    {
        listBox1.Items.Add(ex.Message);
    }
    void monitor_FileDropped(string FullPath)
    {
        listBox1.Items.Add(FullPath);
    }
}

我做错了什么?

FileSystemWatcher事件未触发

试试这个。对于一个非常相似的任务，

watcher.NotifyFilter = NotifyFilters.FileName;   
watcher.Created += new FileSystemEventHandler(handler);     
watcher.Renamed += new RenamedEventHandler(handler);

这可能是因为文件元数据尚未更新。

如果您持续写入文件，可能会发生这种情况。

您试过以下方法吗:

watcher.Path = directory name;
watcher.NotifyFilter = NotifyFilters.LastWrite;
watcher.Filter = "*.xls";
watcher.Changed += OnDirectoryChange;
watcher.Error += OnError;
watcher.EnableRaisingEvents = true;
// Watch only files not subdirectories.
watcher.IncludeSubdirectories = false;

我认为你的问题在于过滤器和事件。NotifyFilters.LastAccess仅在打开文件时触发。尝试使用:

NotifyFilters.LastWrite | NotifyFilters.CreationTime

这将监视写入/创建的文件。接下来，连接到Created委托来处理新创建的文件:

watcher.Created += YourDelegateToHandleCreatedFiles

FileSystemWatcher的工作方式是首先使用NotifyFilters来限制事件触发器。然后，使用实际事件来完成工作。通过钩接Created事件，您将只在创建文件时工作。

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